linux-kernel - Re: [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHGf_=qG+dUDbzgMxq5tsd5u5thmD4iYDGKmmyvSJt3-1va3vQ@mail.gmail.com>
Date:	Wed, 23 Jan 2013 16:45:12 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Simon Jeons <simon.jeons@...il.com>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Hugh Dickins <hughd@...gle.com>, Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] mm: Fold page->_last_nid into page->flags where possible

> Good question.
>
> There are 19 free bits in my configuration but it's related to
> CONFIG_NODES_SHIFT which is 9 for me (512 nodes) and very heavily affected
> by options such as CONFIG_SPARSEMEM_VMEMMAP. Memory hot-remove does not work
> with CONFIG_SPARSEMEM_VMEMMAP and enterprise distribution configs may be
> taking the performance hit to enable memory hot-remove. If I disable this
> option to enable memory hot-remove then there are 0 free bits in page->flags.

FWIW, when using current mmotm, memory hot memory remove does work w/
CONFIG_SPARSEMEM_VMEMMAP. Recently Fujitsu changed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/